*Disclaimer: I have received the Pennington® Smart Feed™ Sprayer System for free from BzzAgent, but I am not bias to the product that I received.  I am reviewing this like a regular product I bought. 
    The Pennington system is the ultimate, must-have gardening product in the world if you're an avid gardener.  With the easy "just attach the hose and go" sprayer, my experience with it has been truly outstanding, except for a few minor errors.  I was still extremely surprised that how easy it was to use even though I saw the campaign page on BzzAgent already.  You have to use it to know it.  Anyways, I didn't have to  mix anything, unlike the typical fertilizers.  Nevertheless, on my sprayer, there may have been a small defection in that the top of the sprayer does not stay attached.
     Now, for some interesting tips when using this.  Above everything, make sure you are not spending too much time in one area.  Doing this will cause the fertilizer to be concentrated in one spot but not in another.  Additionally, I would not recommend it on mulch because the mulch might absorb some of the liquid.  If you have plants on mulch, dig a little hole if you don't mind defiling your garden in one tiny spot.  My garden is in the spotlight of the sun, and I ensure that my plants are receiving enough water and nutrients from the soil.  Good luck with your Pennington Smart Feed Sprayer System!